CVE-2026-15783

{
  "id": "CVE-2026-15783",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-17T16:17:14.183",
  "lastModified": "2026-10-24T20:10:00.137",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with write access to any repository to read metadata from private repositories they did not have access to, including private repository owners and names, branch names, commit SHAs, commit messages, and the pushing actor. The delegated bypass endpoint resolved a rule suite directly from an attacker-supplied, encoded identifier without verifying that the requesting user could read the rule suite's repository, and because these identifiers are sequential an attacker could enumerate them across the instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.18, 3.18.12, 3.19.9, 3.20.5, and 3.21.3. This vulnerability was reported via the GitHub Bug Bounty program."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de autorización faltante fue identificada en GitHub Enterprise Server que permitía a un usuario autenticado con acceso de escritura a cualquier repositorio leer metadatos de repositorios privados a los que no tenían acceso, incluyendo propietarios y nombres de repositorios privados, nombres de ramas, SHAs de commit, mensajes de commit y el actor que realizaba el push. El endpoint de bypass delegado resolvía una suite de reglas directamente desde un identificador codificado, proporcionado por el atacante, sin verificar que el usuario solicitante pudiera leer el repositorio de la suite de reglas, y debido a que estos identificadores son secuenciales, un atacante podría enumerarlos en toda la instancia. Esta vulnerabilidad afectó a todas las versiones de GitHub Enterprise Server anteriores a la 3.22 y fue corregida en las versiones 3.17.18, 3.18.12, 3.19.9, 3.20.5 y 3.21.3. Esta vulnerabilidad fue reportada a través del programa GitHub Bug Bounty."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "GitHub",
          "product": "Enterprise Server",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.17.0",
              "lessThanOrEqual": "3.17.17",
              "versionType": "semver",
              "status": "affected",
              "changes": [
                {
                  "at": "3.17.18",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.18.0",
              "lessThanOrEqual": "3.18.11",
              "versionType": "semver",
              "status": "affected",
              "changes": [
                {
                  "at": "3.18.12",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.19.0",
              "lessThanOrEqual": "3.19.8",
              "versionType": "semver",
              "status": "affected",
              "changes": [
                {
                  "at": "3.19.9",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.20.0",
              "lessThanOrEqual": "3.20.4",
              "versionType": "semver",
              "status": "affected",
              "changes": [
                {
                  "at": "3.20.5",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.21.0",
              "lessThanOrEqual": "3.21.2",
              "versionType": "semver",
              "status": "affected",
              "changes": [
                {
                  "at": "3.21.3",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-17T16:54:15.772592Z",
          "id": "CVE-2026-15783",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://docs.github.com/en/[email protected]/admin/release-notes#3.17.18",
      "source": "[email protected]"
    },
    {
      "url": "https://docs.github.com/en/[email protected]/admin/release-notes#3.18.12",
      "source": "[email protected]"
    },
    {
      "url": "https://docs.github.com/en/[email protected]/admin/release-notes#3.19.9",
      "source": "[email protected]"
    },
    {
      "url": "https://docs.github.com/en/[email protected]/admin/release-notes#3.20.5",
      "source": "[email protected]"
    },
    {
      "url": "https://docs.github.com/en/[email protected]/admin/release-notes#3.21.3",
      "source": "[email protected]"
    }
  ]
}